부산대학교 도서관

The aim of this study is to evaluate the effect of three bait-formulated insecticides, including Fipronil, Pyripronxyfen and Spinosyns, on the control rate of red invasive fire ants. Two field experiments were conducted, respectively, in Taoyuan and Chiayi Hsien where the infestations of red fire ant were spotted. Repeated counts of active ant mound in each field plot, with a size 100 m^2, were recorded during the period of eight weeks. Two statistical procedures were employed to analyze these two data sets by using the generalized linear models, i.e., the generalized estimating equation (GEE) model and the generalized mixed-effect model (GLMM). The estimates of control rate resulted from GEE and GLMM are quite similar, though the standard errors (SEs) of slope parameter estimates are different substantially. We recommend that the SEs obtained from GLMM can be used to construct relevant confidence intervals, since variance structure of GLMM does have a better description to the variation of data collected. It is worth noting that all three insecticides show remarkable consistency in control rates at the two experimental sites. Among these three insecticides, Fipronil and Spinosyns have a similar effect in reducing active ant hills, and the control rate is better than that of Pyripronxyfen.